1421291 has 2 divisors, whose sum is σ = 1421292. Its totient is φ = 1421290.

The previous prime is 1421267. The next prime is 1421293. The reversal of 1421291 is 1921241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1421291 - 2⁶ = 1421227 is a prime.

It is a Sophie Germain prime.

Together with 1421293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1421293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710645 + 710646.

It is an arithmetic number, because the mean of its divisors is an integer number (710646).

2^1421291 is an apocalyptic number.

1421291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421291 is an equidigital number, since it uses as much as digits as its factorization.

1421291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

The square root of 1421291 is about 1192.1790972836. The cubic root of 1421291 is about 112.4331388717.

The spelling of 1421291 in words is "one million, four hundred twenty-one thousand, two hundred ninety-one".